Asymmetric supercapacitors (ASCs) are emerging as a new class of energy storage devices that could potentially meet the increasing power and energy demand for next-generation portable and flexible electronics. Yet, the energy density of ASC is severely limited by the low capacitance of the anode side, which commonly uses the carbon-based nanomaterials. Here, the demonstration of sulfur-doped MoO3- x nanobelts (denoted as S-MoO3- x ) as the anode for high-performance fiber-shaped ASC are reported. The Mo sites in MoO3 are intentionally modulated at the atomic level through sulfur doping, where sulfur could be introduced into the MoO6 octahedron to intrinsically tune the covalency character of bonds around Mo sites and thus boost the charge storage kinetics of S-MoO3- x . Moreover, the oxygen defects are occurring along with sulfur-doping in MoO3 , enabling efficient electron transport. As expected, the fiber-shaped S-MoO3- x achieves outstanding capacitance with good rate capability and long cycling life. More impressively, the fiber-shaped ASC based on S-MoO3- x anode delivers extremely high volumetric capacitance of 6.19 F cm-3 at 0.5 mA cm-1 , which makes it promising as one of the most attractive candidates of anode materials for high-performance fiber-shaped ASCs.

中文翻译：

---

原子调制触发MoO3纳米带改善了纤维状超级电容器的性能。

非对称超级电容器（ASC）作为一种新型的能量存储设备正在出现，可以潜在地满足下一代便携式和柔性电子产品不断增长的功率和能量需求。然而，ASC的能量密度受到阳极侧的低电容的严重限制，而阳极侧的低电容通常使用碳基纳米材料。在此，报道了作为高性能纤维状ASC阳极的硫掺杂MoO3-x纳米带（表示为S-MoO3-x）的演示。MoO3中的Mo位点通过硫掺杂有意地在原子水平上进行调节，其中硫可以引入MoO6八面体中，从而固有地调节Mo位点附近键的共价特性，从而提高S-MoO3-x的电荷存储动力学。而且，氧缺陷与MoO3中的硫掺杂一起发生，实现有效的电子传输。正如预期的那样，纤维状S-MoO3-x具有出色的电容，良好的倍率能力和长循环寿命。更令人印象深刻的是，基于S-MoO3-x阳极的纤维状ASC在0.5 mA cm-1时可提供6.19 F cm-3的极高体积电容，这使其有望成为最有潜力的阳极材料之一。性能的纤维状ASC。